title: Switching control of accommodation: experimental and simulation responses to ramp inputs.
abstract: The irregular staircase appearance of the accommodation response to a ramp stimulus, slow movement of a target towards the subject's eye, suggests a switching between different states of control. Experiments and model simulations indicate that blur processing by retina and cortex underlies threshold triggering of the switch. The ON state consists of a fairly high gain, closed-loop control system that minimizes error. The OFF state provides for a quasi-open-loop state and a slow drift to a bias level, under the influence of a leaky integrator.
authors.affiliation: Neurology and Telerobotics Unit, University of California, Berkeley 94720.
authors.forename: F C
authors.initials: FC
authors.lastname: Sun
authors.forename: L
authors.initials: L
authors.lastname: Stark
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D012815:Signal Processing, Computer-Assisted